Pinpoint Test G: DTC C1748 Switch Input Circuit Short To Ground

WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

G1 CHECK THE RECORDED DTCS FROM BOTH THE CONTINUOUS AND ON-DEMAND PARKING AID MODULE SELF-TESTS
- Check the recorded parking aid module DTCs from the continuous and on-demand self-tests.
- Are any DTCs recorded?
- Yes : If DTC C1748, GO to G2.
  All other DTCs, REFER to the PARKING AID MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
- No : GO to PINPOINT TEST B .
G2 CHECK THE PARKING AID SWITCH OPERATION
- Key in OFF position.
- Disconnect: Parking Aid Module C2023.
- While pressing and releasing the parking aid switch, measure the resistance between the parking aid module C3267-11, circuit 1435 (DG/VT), harness side and ground.
  
  Fig 1: Measuring Resistance Between Parking Aid Module C3267-11, Circuit 1435 (DG/VT), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms with the switch pressed and greater than 10.000 ohms with the switch released?
- Yes : GO to G4.
- No : GO to G3.
G3 CHECK CIRCUIT 1435 (DG/VT) FOR A SHORT TO GROUND
- Disconnect: Parking Aid Switch C2035.
- Measure the resistance between the parking aid module C2023-11, circuit 1435 (DG/VT), harness side and ground.
  
  Fig 2: Measuring Resistance Between Parking Aid Module C2023-11, Circuit 1435 (DG/VT), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
- Yes : INSTALL a new parking aid switch. REFER to PARKING AID SWITCH . CLEAR the DTCs. REPEAT the self-test.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
G4 CHECK FOR CORRECT PARKING AID MODULE OPERATION
- Disconnect the parking aid module connector.
- Check for:
  - Corrosion
  - Pushed-out pins
- Connect the parking aid module connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new parking aid module. REFER to PARKING AID MODULE . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.